Superconductivity in the ternary silicide TrIrSi (Tr = Ti, Zr, and Hf). (2nd February 2016) - Kase, Naoki
Abstract: We discover a new superconductor, TiIrSi at T c = 1.4 K, and reveal a superconducting state of Tr IrSi ( Tr = Ti, Zr, and Hf) by using dc magnetic susceptibility, electrical resistivity, and specific heat C ( T ) measurements. Superconductivity of Tr IrSi is confirmed in at T c = 1.4, 1.85, and 3.4 K, respectively. The electronic specific heat of Tr IrSi can be fitted with the theoretical BCS curve of the weak-coupling limit with / = 1.43. Measurements in several magnetic fields suggest that Tr IrSi is a type-II superconducting material with upper critical fields of (0) = 0.751, 0.618, and 2.23 T, respectively. The electron–phonon coupling constants are calculated to be 0.441, 0.464, and 0.545, which are consistent with the weak-coupling limit inferred from the specific jump. The T c of Tr IrSi depends on and is inversely proportional to .